Looking For Colder HD Spark plug

Discussion in 'Other Service and Maintenance' started by dangerdan, Jul 26, 2008.

  1. dangerdan

    dangerdan Junior Member

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    I am running HD 5R6A plugs in front and back cylinder.

    I want to run a colder plug in the back.

    Does HD make one and what is the model number
     
  2. glider

    glider Veteran Member

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    You can find a number of manufacturers if you cross that plug, but I wouldn't do that. Keep them both the same plug.

    Crossed into a champ plug that would be RN12YC for the stock plug. Trying to locate my cross for the champs.

    I believe the champ number goes lower for a cooler plug.
     
    Last edited: Jul 26, 2008
  3. dangerdan

    dangerdan Junior Member

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    I dont want to cross or miss-match plugs.

    Just wanted to know if HD made a plug colder than 5R6A. I will talk to my dealer.

    Thanks guys
     
  4. glider

    glider Veteran Member

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    Nothing to be gained by going to a colder plug. If you are thinking it will make a difference in the engine temp, it wouldn't be measurable and the engine will not run as good as with the stock plug. Generally the only reason for a colder plug is to eliminate a pinging problem from other problems.
     
  5. dangerdan

    dangerdan Junior Member

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    Now thats a reply I can relate to.
    I will continue to use the same HD plug front and back

    Thanks Glider.